personaly i'd say sharingan. not only can it predict thecniques. the special techniques that coe with it (mangekyou and great shinning heaven) would far out weight the byakugen attacks
though the byakugen is always stron since it doesn't have to worry about alternate forms

I think that without a doubt both are very powerful bloodlines. I'd say that the sharingan have many advantages over the byakugan though. that being said i don't think we've been shown just what the byakugan can do, atleast not to the same extent as the sharingan, what with sasuke and kakashi being two of the main characters.. or something.

well i know we've seen some of it, but still we've seen kakashi and sasuke, as well as itachi, use the sharingan over and over again in different ways. the byakugan has to be able to do a LOT more than what they've shown us so far.

I'm for the Sharingan because like Balsnac said, but in the first battle it will have a hard time but in the second battle the Sharingan user will have a easier time with the battle against a Byakugan user.

if u go by best of 1 then bayakugan will win but if u go by best of 3 the sharingan will win, but the sharingan has its weaknes and thats hand 2 hand so the winner depands how many matches it will last